Trying to pick which ARC amp .....or other Tube Mono

I am in the process of building a bigger and better system that consist of B&W PM1 mated to the P1vD sub. Plan on running direct XLR to amp/amps from a Wadia DAC feed by music server operating Bitpefect softwear. So here is the rub... What amps to run? I like the sound and look of tube mono blocks and have found myself leaning to ARC, but also want to get a good deal (sub $8k) in something I can grow with. Here is my watch list for your input and recommendations: ARC REF300, REF75, VM220 other's Manley Neo 250, VTL MB250, Cary 805AE.  Thanks for the advice